Compiler fix on latest DMD beta.

Quick fix to allow building shared libraries with LDC on Windows, with LDC on OS X, and with DMD on OS X.

Merge pull request #762 from D-Programming-Language/issue240-dustmite-path-based-deps ...

Fix "dub dustmite" for path based dependencies. Fixes #240.

Fix for issue #782. Analyze the output of pkg-config --libs <lib> and massage them if they appear to already be ready for direct use with the compiler. ...

This change allows using pkg-config within dub with .pc files that were written for use with the compiler directly, which can prove troublesome in some cases (for instance, when using the GtkD debian packages as mentioned in issue #7
82).
Basically, we analyze the output of pkg-config and fix up arguments so that they are suitable for the D compiler invokations through dub.

Arguments handled include:
- double "-L" flags (from gtkd3.pc for example) -> passed as single "-L" flags
- "-defaultlib" flags (from phobos2.pc for example) -> passed as-is (previous dub code used to pass them as "-Ldefaultlib")
- "-pthread" flags (from libavcode.pc for example) -> passed as "-L-l-pthread" (previous dub code used to pass them as-is)

The test case tests for these arguments explicitly, is currently only applicable to DMD frontend versions >= 2.068 as other frontends/versions seems to have some issues with shared libraries.

Merge pull request #786 from MartinNowak/slice_package_name ...

slice name to get base and sub package names

Fix the error regex in the Sublime Text generator ...

Code for the DMD compiler always adds -vcollums flag if the frontend
version is => 2066. The old regex assumes that the error message has
only a line number. This change fixes the generator so that it enables
error navigation for this specific compiler setup.

Avoid API breakage vs. 0.9.24.

slice name to get base and sub package names

Fix dependency resolution for unsatisfyable optional dependencies. ...

If another (unchosen) dependency in the graph had a required dependency to the unsatisfyable version, the resolution process failed, even if not choosing the dependency would have been valid.

Add additional unit test for optional dependencies.

Store path based selections relative to the root package.

Fix loading packages that have a path based selection.

Output sorted dependencies to dub.selections.json. Fixes #709. ...

Also adds a warning message when dub.selections.json fails to load.

Store path based dependencies in dub.selections.json. Fixes #772.

Merge pull request #759 from D-Programming-Language/issue686-multiple-march ...

Fix duplicate compiler switches for nested dependencies. Fixes #686.

Improve error message for unsatisfiable root dependencies.

Add build type settings after recursive target collection. Fixes #686. ...

Build type settings of dependencies used to accumulate in the dependent projects. This change now adds the build type settings only once after all targets have been collected.

Adjusts path based dependencies for "dub dustmite" for all dependencies. Fixes #240.

Add mutable overload of Project.getTopologicalPackageList.

Fix "dub dustmite" for path based sub-package references. ...

Also fixes storing the base package for a referenced sub package in the reduction folder. It used to write the package recipe of only the sub package, but now correctly writes the recipe of the full package (base and sub packages).

Filter out invalid dependencies before starting the resolution process. ...

Package versions for which it is not possible to get an actual package description (e.g. due to non-existent paths or semantic errors in the package description) are now excluded from the dependency resolution process. Before this, they could erroneously be picked, resulting in an malformed dependency tree.

Fix purging of optional dependencies when sub packages are involved.

Fix test variable names.

Implement new optional dependency semantics. Fixes #361. ...

If no dub.selections.json file exists yet, optional dependencies will stay deselected by default, unless the "default" flag is set. If dub.selections.json exists, optional dependencies will only be used if present in that file, independently of their local installation state.

Add "default" flag to Dependency and fix "*" to match optional dependencies.

Extend DependencyResolver to properly handle optional dependencies.

Output hierarchical log messages during dependency collection.

Change internal logic error to assertion and improve error message. ...

After dependency resolution and Project.reinit(), *all* required dependencies should be present in m_dependencies.

Merge pull request #766 from D-Programming-Language/issue754-path-dependency-fail ...

Let dub.selections.json always have precedence. Fixes #754.

Merge pull request #738 from Yoplitein/cmakeBackslashes ...

CMake generator: always use forward slashes in paths